looking for a reshader

If you have an Nvidia card in the 900 series or later (maybe earlier), there is Nvidia Freestyle. This is enable in GFE under "Experimental". It supports a number of games, including ESO, with nothing extra needing to be installed.

You setup a hotkey of your choice (I use Alt-Z) to access the menu in-game and see post-process shading and changes in realtime.